Shoe-sewing machine



Jan. 14, 1930. V J. SUNDER ETAL- 1,743,735

SHOE SEWING MACHINE Filed Dec. 21, 1923 s Sheets-Sheet 1 I Inventors;

1930. I J. SUNDER ET AL 1,743,735 SHOE SEWING MACHINE Filed Dec. 2r; 1923 s Sheets-Sheet 2 1 1' n are 2 fin-,-

Jan. 14, 1930. J. SUNDER ET AL SHOE SEWING MACHINE Filed 060. 21. 1923 s Sheets-Sheet 3 In 06 n10 r3;

Patented Jan. 14, 1930 UNITED STATES PATENT OFFICE JAKOIB S'ilND'ER AND EBERHARDT RENNO, OF OBERURSEL, GERMANY, ASSIGNORS' TO THE FIR-M F ADRIAN & BUSGI-I, OF OBERURSEL A. 'l., GERMANY SHOE-SEWING MACHINE Application filed December 21, 1923, Serial No. 682,088, and in Germany December 28, 1922.

It is customary with shoe sewing machines to drive the working instrumentalities by eccentrics or cranks positively connected to the said instrumentalities by appropriate linkages. But the different instrumentalitiesperform oscillating movements of somewhat different characters, for instance, in lock stitch outsole sewing machines the awl is advanced and retracted once in every revolution of the machine shaft, while the needle is imparted a twofold movement i. e. the

main oscillating movement for forming the loop and a small additional oscillation in the retracted position of the needle in order to free the formed loop and to facilitate the loop to be taken by the rotary hook. In welt sewing machines the needle performs during every cycle a single oscillation forwards and backwards, while the needle-guide should remain stationary during a certain angle of rotation and the thread finger should perform an'additional small oscillation in one of its extreme positions. Owing to'these different movements heretofore separate eccentrics and associate linkages have been provided for every single instrument.

It is the object of the present invention to simplify the construction of the machine referred to and to lessen the number of its moving parts. provides newmeans for deriving the diflerent movements of two or more instrumentalities from a single eccentric. The eccentric strap drives a lever swinging about a fixed shaft of the machine and it is anessential feature of the present invention that the pivoted carriers of the instrumentalities are directly or indirectly connected by different links at different points to the same single swinging lever.

the points of their connection may be easily so chosen that the driving linkageofone instrument passes during its oscillation a little the dead position; on the other hand the driving linkage of the other instrument does not reach the dead position as it oscillates partly in an arc of a circle about the pivot connecting the linkage with the instrument as its centre, so that the latter remains 59 temporarily stationary. By these means the To this end the invention The lengths of the links andlinkage of the needle passes the dead position while the linkage of the awl is approaching its extreme advanced position and causes the small additional vibratory movement of the needle, notwithstanding the driving lever being common'to the needle and to the awl. The awl pierces in its advanced position the work and moves with it laterally, at the same time the needle makes in its retracted position the small additional oscillation to give off the loop to the rotating hook. In welt sewing machines the needle pierces the work and performs its full oscillation while the needle-guide follows the needle until it comes into contact with the work and remains stationary until the needle returns. Further to a single oscillation of the needle corresponds a double oscillation of the thread finger. V

It is evident that the small number of the driving members for the different instruments diminishes the weight and the wear of the running parts of the machine and presents a substantial progress of. the art, especially of shoe sewing machines running at high speeds.

Theabove, with other features of my in.- vention, will be'hereinafter fully described, and set forth in the claims.

In the drawings Figs. 1-4 illustrates the different positions of the needle and the cooperatingparts of a sole sewing machine embodying the present invention. Fig. 5 is a front elevation of the chief working parts of the ma'chine shown in Figs. 1-4, partly in a vertical section. Fig. 6 is a side view of these parts as seen from the left of Fig. 5. Figs. 7-11 illustrate the invention as applied to a welt sewing machine. show the driving parts with the needle and needle guidein the backward and forward position respectively. Fig. 9 is a section on the line A-B of Fig. 7. Fig. 10 shows the parts as seen from below of Fig. '8. Fig. 11 shows a modification comprising the combination of the needle drive with the drive of the thread finger. Figs. 12 and 13 are diagrams of the movements of the needle and of the'thread finger resulting from the combination shown in Fig. 11.

Figs. 7 and 8 Lil needle-carrier and to the awl-carrier 11 respectively. The carriers 10, 11 are revolubly mounted upon the common shaft 12, but separate shafts may beprovided for. The link 9 consists of halves to accommodate at the ends the joint balls 13, 14 andallows of a sideward movement of the awl carrier upon the shaft 12. The ball 13 is rotatably mounted on the bolt 15 of the driving lever 4 and the ball 14'is likewise mounted on a bolt of the awl-carrier -11.

lVhile the eccentricl makes'one revolution the needle-carrier 10 performs a twofold oscillation. In the drawing (see Fig. 6) three characteristic positions of the link 8 are shown i. e.'the upper position drawn in full lines, the lower position drawn in dotted lines and. the middle position. It is to be ioted that the middle positionis the dead position ofthe driving lever 4and of the link 8, the shaft7 andthe pivots 16, 17 of the link 8 being in one plane. The deadposition of the members 4, 8 correspondsto the most retracted position of the needle. As soon as the members 4, 8 pass the dead position moving into the lower positionthe needle18fadvances a short distance from its most retracted position. IVhen the members 4, 8 return into the middle positionthezneedle comes back into the most retracted position. This is the small oscillatory movement ofthe needle, providedto free the loop from the barb of the needle. The movement of the members 4, 8 from the middle position intothe upper position and back serves to catch-the thread andto draw it through the work forming the loop. From an inspection of the drawing, see Fig. 6, it will be apparent that in distinction to the members 4, 8 the members 4, 9f'do not reach the dead position and that the'awl 19 makes. during every revolution only a single oscillation.

The parts 4, 5, 1 form a four-sidelinkage, the machine frame 'betweenthe shafts 2, 7 representing the fourth unmovable side of the linkage. The shafts 2, 7 andthe'bolt 3 are three pivots of the four-side linkage, the eccentric 1 carrying the strap 5 representing the fourthpivot, asthe eccentric 1 may evidently be substituted'by a crank; 7 V Figs- 7 and 8 show adiiferent connection of the pivotedcarriersof theinstrumentahties with the driving lever 4'. The needle carrierlO is attached to the driving lever 4 by means of thev pivot VI, the link 22 and the pivot V, while the connection of the driving lever 4 with the swinging lever 23 of the needle guide 24 is an indirectonethe swingtinues its movement.

ing lever 23 being attached to the link 22 by means of the pivot IX, the intermediate link 25 and the pivot VIII. The needle carrier 10 (see Fig. 9) is revolubly mounted in the machine frame 26 by means of its hollow hub 27. The latter accommodates the pivot VII. The needle guide 24 is fastened to the pivot VII by the nut 28 and has the form of a knee lever. Into the knee projects the dog 29 of the lever 23 to swing in unison with the needle guide- 24. The nut 30-keeps the hub 27 of the needle-carrier 10, the lever 23 and the needle guide 24 in place. The needle guide hasto support the needle and to prevent the needle. deviating from its path. While the needle moves from the position shown in Fig.7 into the positionshown in Fig. 8 it is at first followed by the guide. When the needle pierces the work and the guide is about to come in contact with the latter the guide interrupt-s its movement while the needle con- The movement of the link 22 is determined on the one hand by the lever 4 drivenby the eccentric land on .the other hand by the pivoted carrier 10 of: the needle. So for instance the. connecting link 22 is lowered at one end by the driving lever 4 and at the sametime raised at the other end by the pivoted carrier 10. The different points of the connecting link 22 describe therefore difierent ways and for the attachment of the intermediate link- 25 a point may be chosendescribing during a certain angle of. rotation a circular pathabout the pivot' IX as a centre. It isevident that during this angle of rotation the swinging lever 23 of the needle guide will remain stationary not.- withstanding the needle continuing its movement. The interruption of the movement of the needle guide is a distinct and a comparatively long one as compared with the interruption obtained by the dead'position of a-drivingilinkage. The instruments 18 and'24 in stead of being directly attached to the carrier lO'and- 23 respectively maybe associated to these partsby intermediate means.

Fig. 11 shows the arrangementfor-driving the thread finger 31. For the sake of clearnessthe elements-for simultaneously driving 4 the needle guide are omitted. In thisinstance too the link 22 is connected by the pivots V and VI to the driving lever 4 and to theneedle carrier 10 respectively; The needle carrier 10 is revolubly mounted onthe fixed pivot VII. A: link-250 is pivoted at XVIII to the link 22 and is connected to the lever 230 by the pivotXIX. The lever 230 swings about the fixed'shaft X. The path of'the pivot XIX is not a simple forward and backward oscillation about the shaftX, as the pivot XIX performs in its lowest position a small additional oscillation, as, required in moving the thread finger, the extent and the duration of which depends uponthe positionof the pivot XVIII on the connecting link 22 and upon the length of the links 250 and 230.

The thread finger 31 forms one end of the two-armed lever 32 revoluble on the pivot VII and connected at its other end by the pivot XII-and the link 33 to the pivot XI provided on the swinging lever 230. The movement of the thread finger 31 is of a smaller extent and of a reverse direction than the movement of the pivot XIX.

Figs. 12 and 13 illustrate diagrammaticallythe mechanical movement of the needle guide and of the thread finger respectively. According to Fig. 12 the pivot VIII describes the path a b 0, while the pivot V travels into the position V. The way a b c is an arc of a circle, the centre of which lies at (Z, so that the lever 23 of the needle guide remains stationary while the pivot VIII is moving on the arc Z) 0.

According to Fig. 13 the pivots XVIII and XI moving clockwise into the position denominated XVIII and XI respectively cause the pivot XII and the finger 31 to travel in the reverse direction into the position XII and 31 respectively. The continued movement of the pivots XVIII and XI in the clockwise direction causes the thread finger to return a nd to swing in the like direction. This reverse and return movement of the thread finger forms the desired small additional oscillation.

Figs. 1 to 4 illustrate the succeeding working positions of the needle and of the cooperating instruments as applied to a sole sewing machine including a take-up 34. In the position shown in Fig. 1 the needle has pierced the work and catches the thread; the take-up lever 34 has reached the end of its downward stroke. The thread finger 31 pulls the thread rearward and the looper 35 manipulates the thread into the barb of the needle 18. needle begins to return and to draw the loop through the work. In the wholly retracted position of the needle the loop spreader 20 opens the loop (see Fig. 2) to be taken by the rotating hook 21. To ensure the operation of the revolving hook, the needle 18 advances a little and frees the loop from the barb, see Fig. 3. F inally the needle returns to its most retracted position, see Fig. 4. By the rotation of the hook 21 the loop is passed round the bobbin case 36 until it reaches the down from the bobbin case must be taken 7 care of by a rapid movement of the take-up lever.

What we claim is 1. In a lock-stitch shoe sewing machine, a continuously rotating eccentric, a swinging The i lever driven by the eccentric, an instrument performing a single oscillation, an instrument performing during every cycle of operation a double oscillation, and separate means connecting both instruments to the said swinging lever.

2. In a shoe sewing machine, a continuously rotating eccentric, a swinging lever drivenby the eccentric, a pivoted needle carrier, a pivoted awl carrier, a link connecting the needle carrier with the swinging lever and passing during every operation the dead position of the parts so connected, and a second link connecting the awl carrier with the swinging lever and not reaching the dead position of the parts so connected.

3. In a lock-stitch shoe sewing machine, a continuously rotating eccentric, a swinging lever driven by the eccentric, a pivoted needle-carrier, a pivoted awl carrier, separate links connecting the carriers to and attached at difierent points of the said swinging lever, one link having at its ends ball joints to enable a lateral movement of the linked awl carrier.

In testimony whereof we afiix our signatures.

J AKOB SUNDER. EBERHARDT RENNO. 

